overrides.update(config_override or dict())
         for item in overrides.items():
             command_args.append('rc.{0}={1}'.format(*item))
-        command_args.extend(map(six.text_type, args))
+        command_args.extend([
+            x.decode('utf-8') if isinstance(x, six.binary_type)
+            else six.text_type(x) for x in args
+        ])
         return command_args
 
     def _get_version(self):
         if task.saved:
             for field in task._modified_fields:
                 add_field(field)
+
         # For new tasks, pass all fields that make sense
         else:
             for field in task._data.keys():
+                # We cannot set stuff that's read only (ID, UUID, ..)
                 if field in task.read_only_fields:
                     continue
+                # We do not want to do field deletion for new tasks
+                if task._data[field] is None:
+                    continue
+                # Otherwise we're fine
                 add_field(field)
 
         return args
         )
 
         config = dict()
-        config_regex = re.compile(r'^(?P<key>[^\s]+)\s+(?P<value>[^\s].+$)')
+        config_regex = re.compile(r'^(?P<key>[^\s]+)\s+(?P<value>[^\s].*$)')
 
         for line in raw_output:
             match = config_regex.match(line)
                         return_all=False):
         command_args = self._get_command_args(
             args, config_override=config_override)
-        logger.debug(' '.join(command_args))
+        logger.debug(u' '.join(command_args))
+
         p = subprocess.Popen(command_args, stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
         stdout, stderr = [x.decode('utf-8') for x in p.communicate()]
                 error_msg = stderr.strip()
             else:
                 error_msg = stdout.strip()
+            error_msg += u'\nCommand used: ' + u' '.join(command_args)
             raise TaskWarriorException(error_msg)
 
         # Return all whole triplet only if explicitly asked for
 
 REPR_OUTPUT_SIZE = 10
 PENDING = 'pending'
 COMPLETED = 'completed'
+DELETED = 'deleted'
+WAITING = 'waiting'
+RECURRING = 'recurring'
 
 logger = logging.getLogger(__name__)
 
         # their data dics are the same
         return self.task == other.task and self._data == other._data
 
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
     __repr__ = __unicode__
 
 
             # If the tasks are not saved, compare the actual instances
             return id(self) == id(other)
 
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
     def __hash__(self):
         if self['uuid']:
             # For saved Tasks, just define equality by equality of uuids
     def pending(self):
         return self['status'] == six.text_type('pending')
 
+    @property
+    def recurring(self):
+        return self['status'] == six.text_type('recurring')
+
     @property
     def active(self):
         return self['start'] is not None
     def completed(self):
         return self.filter(status=COMPLETED)
 
+    def deleted(self):
+        return self.filter(status=DELETED)
+
+    def waiting(self):
+        return self.filter(status=WAITING)
+
+    def recurring(self):
+        return self.filter(status=RECURRING)
+
     def filter(self, *args, **kwargs):
         """
         Returns a new TaskQuerySet with the given filters added.
 
         self.tw.tasks.all()[0].done()
         self.assertEqual(len(self.tw.tasks.completed()), 1)
 
+    def test_deleted_empty(self):
+        Task(self.tw, description="test task").save()
+        self.assertEqual(len(self.tw.tasks.deleted()), 0)
+
+    def test_deleted_non_empty(self):
+        Task(self.tw, description="test task").save()
+        self.assertEqual(len(self.tw.tasks.deleted()), 0)
+        self.tw.tasks.all()[0].delete()
+        self.assertEqual(len(self.tw.tasks.deleted()), 1)
+
+    def test_waiting_empty(self):
+        Task(self.tw, description="test task").save()
+        self.assertEqual(len(self.tw.tasks.waiting()), 0)
+
+    def test_waiting_non_empty(self):
+        Task(self.tw, description="test task").save()
+        self.assertEqual(len(self.tw.tasks.waiting()), 0)
+
+        t = self.tw.tasks.all()[0]
+        t['wait'] = datetime.datetime.now() + datetime.timedelta(days=1)
+        t.save()
+
+        self.assertEqual(len(self.tw.tasks.waiting()), 1)
+
+    def test_recurring_empty(self):
+        Task(self.tw, description="test task").save()
+        self.assertEqual(len(self.tw.tasks.recurring()), 0)
+
+    def test_recurring_non_empty(self):
+        Task(self.tw, description="test task", recur="daily",
+             due=datetime.datetime.now()).save()
+        self.assertEqual(len(self.tw.tasks.recurring()), 1)
+
     def test_filtering_by_attribute(self):
         Task(self.tw, description="no priority task").save()
         Task(self.tw, priority="H", description="high priority task").save()
         t2 = self.tw.tasks.get(uuid=t1['uuid'])
         self.assertEqual(t1.__hash__(), t2.__hash__())
 
+    def test_hash_unequal_unsaved_tasks(self):
+        # Compare the hash of the task using two different objects
+        t1 = Task(self.tw, description="test task 1")
+        t2 = Task(self.tw, description="test task 2")
+
+        self.assertNotEqual(t1.__hash__(), t2.__hash__())
+
+    def test_hash_unequal_saved_tasks(self):
+        # Compare the hash of the task using two different objects
+        t1 = Task(self.tw, description="test task 1")
+        t2 = Task(self.tw, description="test task 2")
+
+        t1.save()
+        t2.save()
+
+        self.assertNotEqual(t1.__hash__(), t2.__hash__())
+
     def test_adding_task_with_priority(self):
         t = Task(self.tw, description="test task", priority="M")
         t.save()
 
     def test_normal_to_lazy_equality(self):
         assert self.stored == self.lazy
+        assert not self.stored != self.lazy
         assert type(self.lazy) is LazyUUIDTask
 
     def test_lazy_to_lazy_equality(self):
         lazy2 = LazyUUIDTask(self.tw, self.stored['uuid'])
 
         assert lazy1 == lazy2
+        assert not lazy1 != lazy2
+        assert type(lazy1) is LazyUUIDTask
+        assert type(lazy2) is LazyUUIDTask
+
+    def test_normal_to_lazy_inequality(self):
+        # Create a different UUID by changing the last letter
+        wrong_uuid = self.stored['uuid']
+        wrong_uuid = wrong_uuid[:-1] + ('a' if wrong_uuid[-1] != 'a' else 'b')
+
+        wrong_lazy = LazyUUIDTask(self.tw, wrong_uuid)
+
+        assert not self.stored == wrong_lazy
+        assert self.stored != wrong_lazy
+        assert type(wrong_lazy) is LazyUUIDTask
+
+    def test_lazy_to_lazy_inequality(self):
+        # Create a different UUID by changing the last letter
+        wrong_uuid = self.stored['uuid']
+        wrong_uuid = wrong_uuid[:-1] + ('a' if wrong_uuid[-1] != 'a' else 'b')
+
+        lazy1 = LazyUUIDTask(self.tw, self.stored['uuid'])
+        lazy2 = LazyUUIDTask(self.tw, wrong_uuid)
+
+        assert not lazy1 == lazy2
+        assert lazy1 != lazy2
         assert type(lazy1) is LazyUUIDTask
         assert type(lazy2) is LazyUUIDTask
 
 
     def test_config(self):
         assert self.tw.config['nag'] == "You have more urgent tasks."
-        assert self.tw.config['debug'] == "no"
+        assert self.tw.config['default.command'] == "next"
+        assert self.tw.config['dependency.indicator'] == "D"